Green-black dye.



lrrn terns T T FFtQ JULIUS ABEL, OF LUDWIGSHAFEN, GERMANY, ASSIGNOR TO THE BADI SCHE ANILINAND SODA FABRIK, OF SAME PLACE.

GREEN-BLACK DYE.

SPECIFTGATION forming part of Letters Patent N 0. 644,959, dated March 6, 1900.

Application filed December 19, 1899.

, T aZZ whom it may concern.-

Inent ofa certain diphenylamin derivative with sulfur and sodium sulfid. The said diphenylamin derivative is obtained by the condensation of di nitrochlor benzene with ortho-amido phenol para sulfoacid under suitable conditions. The condensation of the ortho-amido-phenol para sulfoacid with dinitro-chlorbenzene leads to the production of a new ortho-hydroxy-dinitro-diphenylaminsulfoacid, and this, after the treatment with sulfur and sulfid ofsodium, yields a coloringmatter that dyes unmordanted cotton greenblack. The condensation withdinitro-chlorbenzene is effected in the presence of bodies that are capable of binding hydrochloric acid.

Judging by the method of formation the new initial material for use in making my coloring-matter has the following constitutional formula:

on No,

NO. nu J The following example will serve to further illustrate the manner in which my invention can be carried into practical effect and my new coloring'matter obtained. The parts are by weight:

Examplc-Production of green-black coloring-matter from ortho hydroocy dzm'tro (Z1 phcnyZamin-suUoacid.Prepare the required diphenylamin derivative by heating in a vessel furnished with an. inverted condenser an aqueous solution of the sodium salt of orthoamido-phenol-para-sulfoacid with the equimolecular proportion of dinitro-chlor-benzene and with a sufficient quantity of sodium acetate or soda to bind the hydrochloric acid that is set free. Continue the heating until the dinitro-chlor-benzene has practically dis- Serial No. 740,896. (No specimens.) I

appeared. Allow the mixture to cool. The desired diphenylaminderivativeseparatesout in part in the form of its sodium salt as a yel- 5 5 low-red crystalline precipitate. Add common salt to complete the separation, collect, and dry. Mix together forty-two (42) parts of the dry ortho-hydroxy-dinitro-diphenylamin-sulfoacid salt thus obtained with one hundred 6c and fifty (150) parts of crystallized sodium sulfid, forty (40) parts of sulfur, and ten (10) parts of water. Heat the mixture slowly to about one hundred and sixty degrees centi= grade. WVhen the evolution of gas has ceased and the reaction mass has become dry, raise the temperature to about one hundred and seventy degrees and continue heating for some time at this temperature. Allow the mass to cool and reduce it to powder. The product so obtained can be used directly in dyeing.

My new coloring-matter is readily soluble in water, giving a green solution, and can be precipitated from its aqueous solution by 7 5 means of hydrochloric acid or of ammonium chlorid, the precipitate being brown-black and flocculent. It possesses a strong affinity for unmordanted vegetable fiber, which it dyes green-black with an excellent 'fastness against the action of light, acids, soap, and alkalies. The treatment of the dyed goods with chromates, copper salts, and the like does not materially alter or add to the fastness of the shades produced.

Now what I claim is- The new coloring-matter which can be obtained from ortho-hydroxy-dinitro-diphenylamin-sulfoacid, sodium sulfid and sulfur, which is readily soluble in water giving a greenish'solution from which hydrochloric acid and ammonium chlorid precipitate a brown-black flocculent precipitate and which dyes unmordantedcotton giving green-black shades which are not materially altered by treatment with chromates and copper salts, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JULIUS ABEL. Witnesses:

ERNEST F. EHRHARDT, MAX BAzLnN. 

